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Non-aqueous electrolyte and lithium ion battery comprising same

A non-aqueous electrolyte and lithium-ion battery technology, applied in non-aqueous electrolytes, secondary batteries, organic electrolytes, etc., can solve the problems of unsatisfactory batteries, and achieve the effect of both high and low temperature performance of the battery

Pending Publication Date: 2021-09-28
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 1,3-propane sultone is a candidate substance in SVHC. Therefore, most of the batteries currently on the market do not meet the requirement that their internal PS content is ≤0.1%.

Method used

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  • Non-aqueous electrolyte and lithium ion battery comprising same

Examples

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Comparison scheme
Effect test

Embodiment 1-5 and comparative example 2-3

[0066] In Examples 1-5 and Comparative Examples 2-3, the preparation method of the positive electrode sheet, the preparation method of the negative electrode sheet, the preparation method of the electrolyte, the preparation method of the separator, and the preparation method of the lithium-ion battery are all the same as those of Comparative Example 1, the difference Because: the components and contents of the electrolyte are different (the specific components and contents added are shown in Table 1), specifically:

[0067] Composition and content of additive in the electrolyte of table 1 embodiment 1-5 and comparative example 1-3

[0068] PS(A) PS (B) PST(C) A-B C / (A-B) Comparative example 1 4.00 - - - - Comparative example 2 - 0.80 0.45 3.20 0.14 Comparative example 3 - 0.80 1.25 3.00 0.42 Example 1 - 0.80 0.58 3.20 0.18 Example 2 - 0.80 0.65 3.20 0.20 Example 3 - 0.80 0.80 3.20 0.25 Example 4...

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Abstract

The invention discloses a non-aqueous electrolyte and a lithium ion battery comprising the non-aqueous electrolyte. The mass percentage content of PS in the electrolyte is Bwt%, the mass percentage content of 1, 3-propene sultone (PST for short) is Cwt%, and the mass percentage content of PS in a conventional electrolyte is Awt%. According to the invention, a certain proportion of PST with a similar high-temperature effect to PS is compounded into the electrolyte, based on relatively large impedance of PST, when the contents of PS and PST meet the relational expression: 0.17 < = C / (A-B) < = 0.38; through the synergistic effect of PS and PST, the electrolyte with the PS content meeting the control requirement of European Union Chemical Administration (ECHA) on SVHC candidate substances of less than 0.1% can be prepared, and the high-temperature performance and the low-temperature performance of the battery can be ensured; moreover, the electrical performance of the lithium battery containing the low-content PS electrolyte is equivalent to the performance of the battery containing the conventional content PS.

Description

technical field [0001] The invention belongs to the technical field of electrolytes for lithium ion batteries, and in particular relates to a nonaqueous electrolyte and a lithium ion battery including the nonaqueous electrolyte. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields because of their excellent characteristics such as light weight, high specific energy, no memory effect, and good cycle performance. With the increasing application of lithium-ion batteries, consumers have put forward higher requirements for the energy density, cycle life, high temperature performance, safety and other performance of lithium-ion batteries. With the continuous improvement of people's living standards, people's requirements for electronic products are also getting higher and higher. In recent years, the European Chemicals Agency (ECHA) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 曾长安郭如德李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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